CI: Add llvmpipe- prefix to Piglit jobs

To make it easier to differentiate now that llvmpipe & softpipe are
lumped into the same stage.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Acked-by: Eric Anholt <eric@anholt.net>
Acked-by: Michel Dänzer <mdaenzer@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7873>

.gitlab-ci.yml

@@ -1006,7 +1006,7 @@ meson-mingw32-x86_64:
   script:
     - install/piglit/run.sh
 
-piglit-cl:
+llvmpipe-piglit-cl:
   extends:
     - .piglit-test
     - .test-cl
@@ -1020,7 +1020,7 @@ piglit-cl:
   script:
     - install/piglit/run_cl.sh
 
-piglit-quick_gl:
+llvmpipe-piglit-quick_gl:
   extends: .piglit-test
   variables:
     LP_NUM_THREADS: 0
@@ -1035,13 +1035,13 @@ piglit-quick_gl:
       -x maxsize
     PIGLIT_PROFILES: quick_gl
 
-piglit-glslparser:
+llvmpipe-piglit-glslparser:
   extends: .piglit-test
   variables:
     LP_NUM_THREADS: 0
     PIGLIT_PROFILES: glslparser
 
-piglit-quick_shader:
+llvmpipe-piglit-quick_shader:
   extends: .piglit-test
   variables:
     LP_NUM_THREADS: 1